The document discusses sewage as wastewater from various sources, including households and industries, and details its composition of organic and inorganic impurities such as human and animal waste, chemicals, and harmful bacteria. It explains the transportation of sewage through a network of pipes known as sewers, which are typically placed 50 to 60 meters apart. Additionally, it introduces hydrology as the study of water, with practitioners referred to as hydrologists.

1. IDENTIFY THE PICTURES

2. SEWAGE
Sewage is wastewater released from houses,
hospitals, industries, offices, and other sources.
It also includes the rainwater that runs down the
streets in a storm.
The water that washes off the roads and rooftops
contains many harmful substances.
Sewage is a liquid waste.

3. 18.WASTEWATER STORY

4. COMPOSITION OF
SEWAGE

5. ORGANIC IMPURITIES
 HUMAN FAECES
 ANIMAL WASTE
 OIL
 UREA
 PESTICIDES
 HERBICIDES
 FRUIT AND VEGETABLE WASTE

6. NITRATES
PHOSPHATES
METALS
INORGANIC
IMPURITIES

7. NUTRIENTS
• PHOSPHORUS
• NITROGEN

8. BACTERIA
 HEPATITIS
 E.COLI
 STAPHYLOCOCCUS
 VIBRIO CHOLERA
 SALMONELLA PARATYPHI
 PROTOZONES

9. YOU HAVE LEARNT ABOUT SEWAGE AND ITS
COMPOSITION
LET US SEE HOW IT IS TRANSPORTED

10. WHAT DO YOU THINK YOU CAN SEE UNDERGROUND
WHILE WALKING NEAR THE ROAD?
 WE WOULD SEE A NETWORK OF PIPING
UNDERGROUND BIG AND SMALL PIPES.
 THESE ARE CALLED SEWERS. A GROUP
OF SEWERS FORMS THE SEWERAGE.
 THEY ARE LOCATED 50M TO 60M AWAY
FROM EACH OTHER.
 THERE ARE GENERALLY TWO SEWAGE
PIPES ONE CARRIES WATER TOWARD
THE BUILDING THE OTHER ONE CARRIES
WATER AWAY

11. NAME THE STUDY AND PEOPLE WHO STUDY
WATER?
• HYDROLOGY IS THE STUDY OF WATER PEOPLE WHO STUDY IT ARE
HYDROLOGISTS.